Understanding Humidity in Multi-Stop Frozen Food Transport
Every time a delivery truck door opens (10-30+ times per route), warm humid air rushes into the -12°C environment. This moisture condenses instantly and builds up throughout the day, creating a high-humidity environment that attacks your packaging.
Door opens, warm humid air rushes in and meets the -12°C environment
Moisture condenses and cardboard becomes damp and weak
Wet cardboard loses thermal barrier properties - heat transfers faster
Poor insulation allows heat in, goods start to thaw and release more moisture
More moisture = weaker packaging = faster warming. The problem compounds itself!
Thick, quality cardboard resists moisture absorption much better than thin or recycled alternatives
Add a moisture barrier around cardboard boxes to protect from direct humidity exposure
Polystyrene doesn't absorb moisture. With proper ice packs, it's your best defense
Use waterproof tape and seal all seams to minimize humid air penetration into your packaging
Wrap food items in plastic before boxing for an extra moisture protection layer
Completely frozen goods resist temperature fluctuations better and release less moisture
Your packaging must withstand TWO challenges:
Keep cold in, heat out
Resist moisture from door openings
Quality packaging handles both. Poor packaging fails at both.